Hydraulic jet flash mixer with gas diffusion port in the flow deflector

ABSTRACT

A invention chemicals in the form of gases, into a fluid stream. The mixing system withdraws a side stream of fluid from a main fluid stream. The side stream is pressurized and directed through a convergent nozzle, producing a high-velocity jet. This jet is directed onto a deflector plate located on the center line of the conduit that carries the main fluid stream and is thereby diverted in the radial directions normal to the flow direction of the main fluid stream. The deflector is provided with an gas diffudion port for injecting the chemicals that are to be mixed into the main stream. The even distribution of the injected chemicals is ensured by the hydrodynamic forces generated by the flow of the high-velocity jet over the deflector.

FIELD OF THE INVENTION

[0001] This invention relates to mixing chemicals in a fluid stream and more particularly to hydraulic diffusion flash mixing of chemicals in water treatment and waste water treatment.

BACKGROUND OF THE INVENTION

[0002] This invention is a division of application Ser. No. 09/399,390, filed on Sep. 20, 1999. As such the general background of this invention is as is stated for the abovementioned Application. In particular, the portions of the background in application Ser. No. 09/399,390 that pertain to the injection and dispersion of gas into a fluid stream are cited herein. The particular portions of the background are, page 1, line 18 through page 1 line 24, page 2, line 22 through page 3, line 9 and page 3, line 18 through page 6 line 20. The second embodiment of application Ser. No. 09/399,390 is the subject of this application.

SUMMARY OF THE INVENTION

[0003] The summary of the invention is as pertains to the second embodiment of application Ser. No. 09/399,390. The particular portions of the summary are, page 6, line 24 through page 7, line 9, and page 7, line 23 through page 8, line 13.

BRIEF DESCRIPTION OF THE DRAWINGS

[0004]FIG. 1 is a schematic illustration of a water treatment system in which the embodiment of the inventive mixer is being used;

[0005]FIG. 2 shows an embodiment of the inventive mixer in which chlorine gas is introduced into a deflecting device of the mixer;

[0006]FIG. 3 is an enlarged sectional view of the deflecting element of the mixer in FIG. 2;

[0007]FIG. 4 is an enlarged sectional view of the portion of the deflecting element of the mixer in FIG. 3: and

[0008]FIG. 5 is a schematic sectional view of a conduit taken along line 8-8 of FIG. 2 and of FIG. 3 to show how jetted water and injected chemicals disperse throughout the conduit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0009] The detailed description of the invention is as is presented for the second embodiment of application Ser. No. 09/399,390. The particular portions of the detailed description of the preferred embodiment are, page 9, line 8 through page 9, line 15, and page 10, line 18 through page 12, line 3.

[0010] Operation of the Invention 

1. Apparatus for injecting and mixing chlorine gas into a stream by flash mixing comprising: a) a conduit for carrying the liquid stream without chlorine gas in a first direction; b) Injection means having an outlet for injecting a fluid stream into the liquid stream; c) means for drawing off a portion of the liquid stream from a predetermined position along the conduit and for supplying the drawn-off portion to the injection means to form the fluid jet stream; d) a deflector disposed proximate to and in front of the outlet for deflecting the fluid stream in a second direction transverse to the first direction of the liquid stream, the deflector having a central axis and a passage coincident with the central axis, the passage having an opening at a position of the deflector which is closest to the outlet, for introducing the chlorine gas into the fluid jet stream such that the chlorine gas is carried in the second direction by the deflected fluid jet stream for mixing into the liquid stream: and e) means for conveying the chlorine gas under pressure into the passage, wherein the predetermined position is upstream of the deflector, such that the conduit is adapted for carrying the liquid stream with the chlorine gas mixed therein away from the deflector, thereby avoiding back
 2. The apparatus of claim 1, wherein the deflector comprises a conical form, having a base and a vertex, the vertex being proximate to the outlet and the opening being within a tip located at the vertex.
 3. The apparatus of claim 2, wherein the tip is compromised of a solid hemisphere attached to a tube that in turn is attached to the passage coincident with the central axis, the tube having a multiplicity of ports that allow chlorine gas to flow out of the conduit running through the deflector and into the space between the tip and the body of the deflector.
 4. The apparatus of claim 3, wherein the end of the passage coincident with the central axis is in communication with the means for conveying the chlorine gas.
 5. The apparatus of claim 4, wherein the base of the tip's hemisphere has a larger diameter that the diameter of the deflector's vertex; and the base of the tip's hemisphere is curved in toward the central axis of the deflector.
 6. The apparatus of claim 5, wherein the injection means for injecting injects the fluid jet stream in the first direction.
 7. The apparatus of claim 5, wherein the injection means for injecting comprises a high-velocity jet nozzle at the outlet thereof.
 8. The apparatus of claim 5, wherein the injection means for injecting and the deflector central axes which are aligned.
 9. The apparatus of claim 5, wherein the deflector has a shape such that the fluid jet steam is deflected in a symmetrical pattern.
 10. The apparatus of claim 5, wherein the second direction is normal to the first direction.
 11. The apparatus of claim 5, wherein the deflector is shaped as a surface of revolution about a central axis of the fluid jet stream.
 12. The apparatus of claim 5, further comprising a chlorine contact unit downstream of the deflector, wherein the conduit is adapted for carrying the liquid stream with the chlorine gas to the chlorine contact unit.
 13. Apparatus for injecting and mixing gas into a stream by flash mixing comprising: a) a conduit for carrying the liquid stream without gas in a first direction; b) Injection means having an outlet for injecting a fluid stream into the liquid stream; c means for drawing off a portion of the liquid stream from a predetermined position along the conduit and for supplying the drawn-off portion to the injection means to form the fluid jet stream; d) a deflector disposed proximate to and in front of the outlet for deflecting the fluid stream in a second direction transverse to the first direction of the liquid stream, the deflector having a central axis and a passage coincident with the central axis, the passage having an opening at a position of the deflector which is closest to the outlet, for introducing the gas into the fluid jet stream such that the chlorine gas is carried in the second direction by the deflected fluid jet stream for mixing into the liquid stream: and e) means for conveying the gas under pressure into the passage, wherein the predetermined position is upstream of the deflector, such that the conduit is adapted for carrying the liquid stream with the gas mixed therein away from the deflector, thereby avoiding back
 14. The apparatus of claim 13, wherein the deflector comprises a conical form, having a base and a vertex, the vertex being proximate to the outlet and the opening being within a tip located at the vertex.
 15. The apparatus of claim 14, wherein the tip is compromised of a solid hemisphere attached to a tube that in turn is attached to the passage coincident with the central axis, the tube having a multiplicity of ports that allow gas to flow out of the conduit running through the deflector and into the space between the tip and the body of the deflector.
 16. The apparatus of claim 15, wherein the end of the passage coincident with the central axis is in communication with the means for conveying the gas.
 17. The apparatus of claim 16, wherein the base of the tip's hemisphere has a larger diameter that the diameter of the deflector's vertex; and the base of the tip's hemisphere is curved in toward the central axis of the deflector.
 18. The apparatus of claim 17, wherein the injection means for injecting injects the fluid jet stream in the first direction.
 19. The apparatus of claim 17, wherein the injection means for injecting comprises a high-velocity jet nozzle at the outlet thereof.
 20. The apparatus of claim 17, wherein the injection means for injecting and the deflector central axes which are aligned.
 21. The apparatus of claim 17, wherein the deflector has a shape such that the fluid jet steam is deflected in a symmetrical pattern.
 22. The apparatus of claim 17, wherein the second direction is normal to the first direction.
 23. The apparatus of claim 17, wherein the deflector is shaped as a surface of revolution about a central axis of the fluid jet stream. 